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Message started by verslagen1 on 10/07/12 at 23:00:33

Title: Tuning an '88
Post by verslagen1 on 10/07/12 at 23:00:33

I was never very happy with the tune of the '88.
The engine was replaced with an '01 and now has a stage 1 cam.
MPG is just under 50.

It has a supertrapp with 14 disks. K&N drop in.
Originally had stock jets 47.5 and 155.
Main jet replaced with 152.5 and I've desnorkled and removed the air box door.

I bought an Innovate a/f meter and made an adapter to shove in between the header and muffler.

At idle, it reads ~9 and ~11 at 45 in 4th.

changed the main to 150 and now I've got ~14 at 45 in 4th

Seems my next step is to install a pod filter.

Title: Re: Tuning an '88
Post by ToesNose on 10/08/12 at 04:27:04

Verslagen is the '88 your main ride, or is this a side project?

Title: Re: Tuning an '88
Post by lrutt on 10/08/12 at 05:48:05

14 is too lean, I tend to go a tad on the rich side for an air cooled motor myself, the 11 was better IMO, maybe just a touch leaner. A pod will make it leaner yet. So maybe your 155 with a pod would be about spot on. Although at 45 in 4th you're not really hitting the main jet much, mostly the needle. Main is only really going to give you a reading at WFO.

Title: Re: Tuning an '88
Post by verslagen1 on 10/08/12 at 06:56:44

daily rider

Title: Re: Tuning an '88
Post by verslagen1 on 10/15/12 at 18:25:19

certainly feel the lean condition at speed.
going to put the 152 back in and lower the needle.

Title: Re: Tuning an '88
Post by HondaLavis on 10/16/12 at 06:36:38

Are you talking about a meter similar to this? http://www.ebay.com/itm/INNOVATE-MOTORSPORTS-3844-MTX-L-DIGITAL-AIR-FUEL-RATIO-GAUGE-KIT-8FOOT-CABLE-/120940724864?_trksid=p3284.m263&_trkparms=algo%3DSI%26its%3DI%26itu%3DUCI%252BUA%252BFICS%26otn%3D21%26pmod%3D200803518322%26ps%3D54

Do you have any pics of your installation? I'm very curious to see your adapter. Have you had any sealing issues?

Title: Re: Tuning an '88
Post by verslagen1 on 10/16/12 at 11:37:05

No, I got a LM2. wanted something for diagnosing, not permanent.

The bung sits in a 5" length of 1.625 pipe that's clamped between the header and muffler. Requires that the front mounting bolt of the muffler mounted in the rear hole of the bracket.

Now if I can only figgure out how to get the induction clamp to work I'd be good to go.

Title: Re: Tuning an '88
Post by 07s40scotty on 10/17/12 at 19:35:22

verslagan_ when you say you're going to lower the needle are you increasing the size of the spacer or moving the eclip? Or am I assfused? I've learned alot from your posts & by tearing my carb apart alot lol

Title: Re: Tuning an '88
Post by verslagen1 on 10/17/12 at 19:48:15

I added a washer. That and putting back the 152 has improved my up hill top speed. 88 vs 86 it was 85 with the 150. it'll be the weekend before I can measure the a/f ratio.

Title: Re: Tuning an '88
Post by verslagen1 on 11/24/12 at 10:37:30

My gas mileage has much improved since the last change, over 50 mpg.
Takes less than 2 gals to fill up vs. 2.2 for a 100 mile round trip.

Idle it's about 10 to 11, nary a need for choke except to get the idle speed up, which the 1st notch does nicely.

at 70 it's about 12 to 13
but if I go up to 80, it will go over 15.

seems to me I need to try the 155 again.

Title: Re: Tuning an '88
Post by rextec on 10/22/13 at 19:00:29

You ever get your jetting resolved? Im about to work on an older carb and most of the jetting posts are aimed at the newer models with leaner jetting.

Title: Re: Tuning an '88
Post by verslagen1 on 10/22/13 at 19:21:16

it's gonna depend on your exhaust and intake.
with a supertrapp and k&n drop in filter... stock jets were ok.
slip on a dyna and you'll want to drop down to a 150

Title: Re: Tuning an '88
Post by rextec on 10/22/13 at 20:23:51

Im going to run a UNI foam air filter and a straight 1.75" exhaust (with a "lollipop" for backpressure). i know i will have to fine tune it but do you have any suggestions mainly for the pilot jet size? I just ordered a #50 to replace the stock #47.5